The Doctor and Romana begin to uncover the secrets of Zanak. But the murderous Captain seems to have plans of his own.
| Name | Type | Role | |
|---|---|---|---|
| Douglas Adams | Writer | ||
| Bruce Purchase | Guest Star | ||
| Adam Kurakin | Guest Star | ||
| Primi Townsend | Guest Star | ||
| Andrew Robertson | Guest Star | ||
| David Warwick | Guest Star | ||
| Rosalind Lloyd | Guest Star | ||
| Bernard Finch | Guest Star | ||
| David Sibley | Guest Star | ||
| Graham Williams | Director |